I have a vintage Windsurfer One Design board missing the old t-piece slot and universal joint. I am looking for an original equipment t-piece but in the meantime are thinking of any old universal I can modify to fit and get sailing.
Any ideas/suggestions would be appreciated.

Any new universal could be modified pretty easily by just making up a wooden foot.The wood piece needs to fit very snugly when dry as it will swell up when wet.

Thanks Wazza